[FFmpeg-user] Sending Patches to the Dev List

Jim DeLaHunt from.ffmpeg-user at jdlh.com
Thu Dec 7 11:03:23 EET 2017

On 2017-12-07 00:08, Jon bae wrote:

> Hello,
> on Monday I send a little patch for the *vf_blackdetect.c* filter to the
> dev list, but I don't got any response. I don't wanted to sound impatient,
> I just want to know that I did everything right.
> One thing is to, that my patch is not shown here:
> https://patchwork.ffmpeg.org/project/ffmpeg/list/ so I though maybe I did
> something wrong.
> For generating the patch I use *git format-patch, *send-mail is not working
> on my computer, so I send the patch as an attachment.
> I send the patch from gmail, is this a problem?
> Is there something specific, I need to know about sending the patch per
> mail? (yes I read the page step 6: Submitting patches).
> This was the Mail:
> http://ffmpeg.org/pipermail/ffmpeg-devel/2017-December/221698.html

Welcome to ffmpeg! Thank you for taking the time to create a patch and 
help make the software better.

You are asking this question on the ffmpeg-user list, but patches are 
handled on the ffmpeg-devel list. Are you subscribed to 
ffmpeg-devel at ffmpeg.org?  That is recommended; see 
<http://ffmpeg.org/developer.html#Documentation_002fOther>, heading 
about "ffmpeg-devel".  If you are subscribed to the list, you can be 
sure that your patch came through intact.

You might get better answers on the ffmpeg-devel list, because it is 
about patches. ffmpeg-user is about using ffmpeg, which is a different 

I see three messages from you about "Patch vf_blackdetect" to ffmpeg-devel:
[1] <http://ffmpeg.org/pipermail/ffmpeg-devel/2017-December/221689.html> 
"Here's a patch"
[2] <http://ffmpeg.org/pipermail/ffmpeg-devel/2017-December/221698.html> 
"Here's a patch which works"
[3] <http://ffmpeg.org/pipermail/ffmpeg-devel/2017-December/221691.html> 
"Please forget the last patch"

I can imagine someone reading these three messages and thinking, this 
patch isn't ready.

When you have a new patch, it's good to include "v2" (or "v3", "v4", as 
necessary) in the patch summary to indicate version 2, 3, 4 of the patch.

Also, use the --in-reply-to option of git format-patch to specify the 
Message-Id of the message with the previous version of the patch. This 
makes your new patch a child of the previous patch in the list message 
thread.  You did that with [2], so maybe you know about this option.

Just to check: did you recompile ffmpeg with your patch?  Did you run 
all the FATE tests?

Is there already a test in FATE for the change you made?  If not, 
consider adding a FATE test.  It will prove your change works.

I hope this is helpful. Good luck with the patch,
       —Jim DeLaHunt

     --Jim DeLaHunt, jdlh at jdlh.com     http://blog.jdlh.com/ (http://jdlh.com/)
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